Smith H J
Can J Comp Med. 1978 Apr;42(2):244-5.
During 1971 to 1976 inclusive, 73 black bears, Ursus americanus and one polar bear, Thalarctos maritimus, originating in the Atlantic Provinces of Canada were examined for the presence of trichinosis. The polar bear was infected but all of the black bears were negative.
在1971年至1976年（含）期间，对来自加拿大大西洋省份的73只美洲黑熊（Ursus americanus）和1只北极熊（Thalarctos maritimus）进行了旋毛虫病检查。北极熊被感染，但所有黑熊均为阴性。
